meta: cross-compile tests for other geese

For now this is just darwin/windows, but we'll eventually add support
for {free,open}bsd

Signed-off-by: evalexpr <wilkinsphysics@gmail.com>

.github/workflows/linux.yml

@@ -40,6 +40,24 @@ jobs:
         GOARCH: amd64
       run: go build ./cmd/...
 
-    - name: Test build
+    - name: Cross-compile tests for other geese
+      run: ./test.sh
+
+    - name: Run tests on linux
       run: go test ./...
 
+    - uses: k0kubun/action-slack@v2.0.0
+      with:
+        payload: |
+          {
+            "attachments": [{
+              "text": "${{ job.status }}: ${{ github.workflow }} <https://github.com/${{ github.repository }}/commit/${{ github.sha }}/checks|${{ env.COMMIT_DATE }} #${{ env.COMMIT_NUMBER_OF_DAY }}> " +
+                      "(<https://github.com/${{ github.repository }}/commit/${{ github.sha }}|" + "${{ github.sha }}".substring(0, 10) + ">) " +
+                      "of ${{ github.repository }}@" + "${{ github.ref }}".split('/').reverse()[0] + " by ${{ github.event.head_commit.committer.name }}",
+              "color": "danger"
+            }]
+          }
+      env:
+        SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+      if: failure() && github.event_name == 'push'
+

test.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+function remove_test_files {
+    rm -f ./*test{,.exe}
+}
+
+function fail {
+    printf '%s\n' "$1" >&2
+    # If we fail, clean up after ourselves
+    remove_test_files
+    exit 1
+}
+
+function main {
+    test_dirs=()
+    while IFS= read -r -d '' file
+    do
+        dir=$(dirname "$file")
+        if [[ ! " ${test_dirs[*]} " =~ ${dir} ]]; then
+            test_dirs+=("$dir")
+        fi
+    done <   <(find . -type f -iname '*_test.go' -print0)
+
+    for goos in openbsd darwin windows
+    do
+        for dir in "${test_dirs[@]}"; do
+            echo "Testing GOOS=$goos in dir $dir"
+            GOOS="$goos" go test -c "./$dir" || fail "Test failed using $goos and $dir"
+        done
+    done
+
+    # If all goes well, we should still clean up the test files
+    echo "Test complete"
+    remove_test_files
+}
+
+main "$@"
+